Changing The Gas Type - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Venting the boiler by flushing
B
A
Fig. 17
1. Close the shut-off valves on the heating water side.
2. Remove cover panel
3. Connect the drain hose fitted at top valve
drain connection.
4. Open fill valve and air vent valve
C
mains pressure until no sound of escaping air can
be heard.
Note
Check the system pressure at the pressure gauge.
Never exceed 1.5 bar (150 kPa).

Changing the gas type

In the delivered condition, the boiler is set up for oper-
ation with natural gas (G 20).
For operation with a different gas type, install a conver-
sion kit and change the gas type at the control unit.
Separate installation instructions
22
C
.
A
to a
B
and vent at
B
(cont.)
5. First close valve
6. When the required operating pressure has built up,
close valve C . Minimum system pressure 0.8 bar
(80 kPa)
Open the shut-off valves on the heating water side.
7. Remove the drain hose again from top valve
and retain outside the boiler.
Enter the selected gas type and the associated limits
for flue gas emissions in the table below.
For values, see separate installation instruc-
tions.
.
B
B